Viscosity is governed by the strength of intermolecular forces and especially by the shapes of the molecules of a liquid. Liquids whose molecules are polar or can form hydrogen bonds are usually more viscous than similar nonpolar substances.
What makes things more viscous?
Viscosity refers to the resistance to flow. Low viscosity means that it is easy to flow. Generally, heating reduces but moisture increases the viscosity of a rock. In addition, different rocks have different viscosities.
How do you know if a liquid has a high viscosity?
Fluids with low viscosity have a low resistance and shear easily and the molecules flow quickly; high viscosity fluids move sluggishly and resist deformation. Some liquids, like pitch, glass and peanut butter, have such high viscosity they behave like solids.
How do you measure viscosity in chemistry?
You can measure the viscosity of a liquid by measuring the velocity of a sphere as it falls through the liquid. The velocity of the sphere, combined with the relative densities of the sphere and the liquid, can be used to calculate the viscosity of the liquid.
Which has a higher viscosity?
Viscosity is a measure of how much a Substance resists flowing freely. Solids have high viscosity because they cannot flow freely.
Which Substance has highest viscosity?
So, glycerine has the greatest viscosity.
What 3 factors determine the viscosity of a liquid?
The viscosity of liquids generally depends upon the size, shape and chemical nature of their molecules. It is greater with larger than with smaller molecules; with elongated than with spherical molecules.
How do you know which substance has the lowest viscosity?
Viscosity is measured using a viscometer. Measured values span several orders of magnitude. Of all fluids, gases have the lowest viscosities, and thick liquids have the highest.
Are bigger molecules more viscous?
A liquid with smaller molecules has a lower viscosity than a liquid with larger molecules because smaller molecules slide past each other more easily.
Does higher viscosity mean thicker?
In layman’s terms, viscosity defines a fluid’s resistance to flow. The higher the viscosity of a liquid, the thicker it is and the greater the resistance to flow.
What makes the substance more viscous and less viscous?
Why are some liquids more viscous than others? Large, bumpy molecules create more friction than small, smooth molecules Viscosity is determined in large part by the shape of the molecules in a liquid.
Is low viscosity thick or thin?
Viscosity is a measure of that internal friction, or its resistance to flow. Its helpful to think of it in these terms: Thin and light describe fluids with low viscosity. Thick and heavy describe fluids with high viscosity.
How do you measure viscosity in an experiment?
To measure viscosity, fill a graduated cylinder with the liquid to be measured and mark the liquid’s positions at the top and bottom of the cylinder. Drop a marble into the liquid and start a stopwatch, then record the time it takes for the ball to drop between the marks.
What does viscous mean in chemistry?
Viscosity is another type of bulk property defined as a liquid’s resistance to flow. When the intermolecular forces of attraction are strong within a liquid, there is a larger viscosity.
What does viscosity mean in chemistry?
Viscosity is a measure of a fluid’s resistance to flow. A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion. Gases also have viscosity, although it is a little harder to notice it in ordinary circumstances.
Which liquid is the less viscous?
The least viscous at any temperature must be superfluid liquid helium.
Which of the following liquid is more viscous?
Here oil is the most viscous liquid.
What liquids have high viscosity?
Honey, molasses, and melted chocolate are very difficult to pour and often we reach for a spoon or other utensil to speed the process. These are all examples of high viscosity liquids. Peanut butter, jam, and caramel often don’t pour at all and require utensils to get them out of the container.
What does viscosity depend on?
The viscosity of a liquid usually depends on its temperature. Viscosity generally decreases as the temperature increases. Viscosity generally increases as the temperature decreases. The viscosity of a liquid is related to the ease with which the molecules can move with respect to one another.
What are the main factors that affect viscosity?
- Increase in temperature decreases viscosity.
- Increases in pressure increase viscosity in liquids. In water, it decreases whereas, in gases, it remains the same.
Does concentration affect viscosity?
When the solid concentration increases, the viscosity increases because of the increase in hydrogen bonding with hydroxyl groups and the distortion in the velocity pattern of the liquid by hydrated molecules of the solute.
How does particle size affect viscosity?
Increasing Particle Size Decreases Viscosity The viscosity of a material increases only slightly if there is an increase in its particle size, because any relative increase in the particle’s effective hydrodynamic size caused by surface charge or adsorption layers is trivial.
How does viscosity change with concentration?
The more concentrated a polymer solution, the more large molecules you have exerting drag and interacting with each other. Higher concentration leads to a higher viscosity measurement.
Is high or low viscosity better?
Thin, low viscosity oils flow easier to protect engine parts at cold temperature. Thick, high viscosity oils are typically better at maintaining film strength to protect engines at high temperatures.
Is higher viscosity thinner?
Engine oil viscosity refers to how easily oil pours at a specified temperature. Thin oils have lower viscosity and pour more easily at low temperatures than thicker oils that have a higher viscosity. Thin oils reduce friction in engines and help engines start quickly during cold weather.